Laves phase intermetallic matrix composite in situ toughened by ductile precipitates

SCRIPTA MATERIALIA

卷:140

Article

Knowles, Alexander J.^1,2  Bhowmik, Ayan²  Purkayastha, Surajit¹  Jones, Nicholas G.¹  Giuliani, Finn²  Clegg, William J.¹  Dye, David²  Stone, Howard J.¹ 

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0F3, England

[2] Imperial Coll, Dept Mat, London SW7 2AZ, England

关键词: Intermetallics;    Composites;    Precipitation;    Orientation relationship;    Mechanical properties;   

DOI  :  10.1016/j.scriptamat.2017.06.043

来源: Elsevier

【 摘 要 】

Laves phase based materials are of interest for elevated temperature applications for their high melting points and strengths but are critically limited by their low fracture toughness. Here, a Laves phase intermetallic matrix composite toughened by ductile precipitates has been studied. This microstructure was produced in situ by heat treating a Fe-2(Mo,Ti) based alloy to precipitate similar to 12% volume fraction of fine similar to 250 nm bcc, A2 (Mo,Ti), phase, with an orientation relationship of [100](c14)//[113](A2), [010](c14)//[1 (11) over bar](A2), [001](c14)//[12 (1) over bar](A2). The precipitated A2 phase increased the indentation fracture toughness from 1.1 to 2.2 MPa m(1/2) while maintaining a high hardness of HV0.5 = 8.9 GPa similar to monolithic Laves phases. Crown Copyright (C) 2017 Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free